One of the nation's largest and oldest children's hospitals is cracking down on parents who bring their kids herbs, extracts or other dietary supplements.

In what it describes as a break from other hospitals, the Children's Hospital of Philadelphia, or CHOP, last month removed most dietary supplements from its list of approved medicines, and established new policies for administering them.

A mashup of innovation and old-school hacking (though none of the participants was bent on doing harm, we're assured), the goal of the competition was to improve the nation's health system and help people navigate the complexities of the Affordable Care Act.